Desmond



(Mode1.)

J. DESMOND. STEAM INJECTOR No. 513,559. Patented Jan. 30, 1894.

ITIUETLJLEIJF J hTLD E5 mu nd iUfmE5EE5- llurrnn STATES JOHN DESMOND, OFDETROIT, MICHIGAN, ASSIGNOR TO THE PENEERTHY INJECTOR COMPANY, OF SAMEPLACE.

STEAM-INJECTOR.

SPECIFICATION forming part of Letters Patent No. 513,559, dated January30, 1894.

Application filed April 21, 1893. Serial No. 471,260. (ModeL) To allwhom it may concern:

Be it known that I, JOHN DESMOND, a citizen of the United States,residing at Detroit, in the county of Wayne and State of Michigan, haveinvented certain new and useful Improvements in Steam-Injectors, ofwhich the following is a specification, reference being had therein tothe accompanying drawing.

My invention relates particularly to new and useful improvements inautomatic steam injectors.

The main object of my invention is to pr 0- vide a steam injector ofthis kind with simple and efficient means for automatically starting theinjector, and for maintaining the stream under extreme conditions oftemperature of the feed water and pressure of the steam.

To this end my invention consists of an injector having two separateoverflow valves automatically controlling the initial and the secondaryoverflow respectively and adapted to be reciprocally unseated by thepressure of the initial overflow and seated at the proper timeindependently of each other bythe pressure of the secondary overflow.

My invention further consists in the novel construction and arrangementof a valve for regulating the quantity of the incoming water solely inrelation to abnormal pressures of steam, and further in certain detailsof construction, combination and arrangement of parts, substantially ashereinafter fully set forth and particularly pointed out in the claims.

In the accompanying drawing my improved injector is shown in verticallongitudinal sectional view.

A represents the casing of the injector which is provided with the steaminlet branch A, the Water inlet branch A the overflow branch A and thedelivery branch A to each of which is connected the respective pipeconnection (not shown) all constructed and arranged to operate as in theusual manner.

B is the steam inlet tube, 0 is the suction tube and D is the combiningand delivery tube, all in suitable relation to each other and secured insuitable partitions in a shell, which divide the casing into a steamchamber E, a

water chamber F, an exhaust or overflow chamber G and a delivery chamberH. The steam inlet branch communicates into the steam chamber E, theouter end of which is closed by a screw plug I through which the stem Jof the valve passes. This stem is pivotally secured to a lever K whichis f ulcrumed at K to a vibratory link K which is secured in anysuitable manner to the casing.

The steam tube B is provided with a tubular extension at which forms aguide bearing for the sleeve bof the valve. This sleeve is secured tothe valve stem by means of a swivel connection which affords aslightplay for the sleeve to be guided freely by the extension. a inopening and closingthe valve, and openings c are formed in the sleevefor steam admission ports.

The water chamber F is provided with an extension F into the waterbranch and communicates therewith through a valve controlled opening L.The valve M controlling said opening has one or more ports d and isoperated by a screw threaded spindle which passesthrough a suitable plugand stufflng box in the casing and carries on the outside a suitableknob or handle for turning the spindle to seat or unseat the valve M.The overflow arm which extendsdownwardlyfromtheunderside of the casingcommunicates through lateral openings N and 0, formed on opposite sidesand in axial line with each other with the valve chambers N O, theformer of which communicates with the overflow chamber G and the latterwith the delivery chamber H. The openings N 0 into the overflow arm arecontrolled by the horizontally sliding wing valves P Q, which are inaxial line with each other, and of different areas, the valveP havingthe larger area. These valves are supported in position by suitabletubular guide bearings e f formed around the openings for the wings toslide on, and the stem of the valve Q extends in contact with or in suchclose proximity to the valve P that the two valves act one upon theother in unseating and seating the valves. Thus in unseating the valve Pthe valve Q will be unseated also, and in seat ing the valve Q, thevalve P will be seated,

also if not otherwise closed. The valveP is provided with a shoulder gwhich extends into the seat of said valve and thereby the valve Ainseating the valve P will be held still open some distance when the valveP is already closed, thus closing the initial overflow in advance of thesecondary overflow. The tubular guide bearing f extends toward the valveP a sufficient distance to form a stop which limits the opening of thevalve P and when thus open it obstructs the discharge of the overflowthrough the opening 0.

The parts being thus constructed and arranged as, shown and describedthey are intended to operate as follows: As shown in the drawing nosteam is admitted to the injector but on opening the steam admissionvalve by means of the lever K the steam will be admitted into theinterior of the injector. The water is admitted into the water chamberfrom the Water branch through the ports 01 (although the valve L may beclosed) and it is drawn up and into the suction tube as soon as a vacuumis created by the flow of steam-into the injector. The valves Q and Pare eitheropen when the steam enters or will be opened by the firstimpulse of steam or steam impelled water on account of there being alarger pressure on the larger valve P against a smaller pressure againstthe smaller valve Q, thus unseating the valve P which also forces openthe valve Q. The water drawn through the suction tube 0 will in thefirst stage of the operation mainly escape into the overflow chamber Gand from there out through the initial overflow opening N into the armsA and hold the valve P open, but as the force of the stream increasesand carries the water into the delivery chamber, the secondaryoverflowwill be established through the opening 0', and the tubular bearing f(aided by the wings of the valve Q) will direct the overflow against thevalve P (which is in its way) and thus tend to close it against theforce of the initial overflow. With the increasing force of the streamthe secondary overflow increases in force while the initial overflowcorrespondingly decreases and thus the valve P is moved to close at theproper time by the preponderating force of the secondary overflow actingdirectly upon it. The valve P is thus adapted to be closed by the forceof the secondary overflow independent of the valve Q and if it is notfully closed in this way it will be closed as soon as there is a vacuumcreated in the chamber G. The valve Q when fully open is virtuallybalanced and thus it can remain open while the valve P is closing. It isclosed at the proper time by the frictional force of the escapingoverflow along the wings of the valve which force at the proper timeovercomes the frictional resistance of the valve on its bearings anddraws it to its seat and thereby establishes the stream into the boiler.Each valve is thus adapted to be closed by the secondary overflow at theproper time one after the other and independently of each other. At

the same time should the valve P from any cause not close of its ownaccord the valve Q reciprocally closes the valve P, but on account ofthe shoulder g the valve P nevertheless closes in advance of the valve Qand the latter cannot close until the proper conditions for seating ithave been established. This relation of the valves provides for theautomatic working of theinjector under dilferent conditions. Thus if avery copious overflow should take place in the chamber G by reason ofvery hot feed water for instance, the valve P would at the proper timebe forced to close by the valve, Q, and the stream would thus beestablished into the delivery chamber and thence into the boiler and theboiler pressure acting on the valv'eQ would keep the valve P closed bysaid pressure and hence the injector is enabled to work with very hotfeed water which it could not do if the valve P were not so held. On theother hand the closing of the valve P may be independently efliectedatthe proper time solely by the force of the secondary overflow, andthus the vacuum in the chamber G is quickly established if the properconditions exist.

The valves P and Q are horizontally sliding valves and thus the actionof gravity does not constitute any factor which governs their automaticoperation and to distinguish this specific feature of the valves fromother valves which are acted on by gravity, I will distinguish them asfloating valves meaning thereby valves which float with the current ofsteam or water. Thus while the valve P is adapted to unseat the valve Qand hold it open by the force of the initial or primary overflow, thevalve Q is adapted reciprocally to seat the valve P and hold it closedby the force of. the secondary overflow. At the same time both valvesare adapted to be seated at the proper time independent of each other bythe force of the secondary overflow.

The specific arrangement of the valves P and Q in relation to theoverflow arm and to the casing is important in one particular, namely,should the check valve in the connection with the boiler become leakyand hot water thus leak into the injector, it cannot find its way intothe water branch A but has a chance to escape freely from the overflowchamber G through the valve chamber N and by forcing the valves P and Qopen out into the overflow arm.

I will now explain the peculiar advantage of the valve M, by supposingthe injector to be used on a locomotive. Here the pressure of the steamvaries within large limits and therefore the quantity of water which theinjector can take care of varies considerably.

In the use of an injector on a stationary boiler the engineer canreadily detect by watching the overflow whether hisinjector has enoughwater or too much and can thereby regulate the quantity of wateradmitted by an ordinary valve. On locomotives this is different.

There the overflow pipe carries the water away to a place below the footboard (as a measure of necessary protection) and the engineer thereforecannot see it. Therefore I arrange the valve L in such a manner thatwhen closed, the ports d admit enough water for any variation of steampressure between fixed limits say between twenty-five pounds and onehundred and twenty-five pounds. Should the steam gage therefore indicatea pressure above one hundred and twenty-five pounds he would know thathe has not enough water (without consulting the overflow) and must openthe valve. Suppose now he knows that by giving the valve one half turnhe admits a quantity of water of which the injector can take care of,say between a pressure of seventy-five pounds and two hundred pounds. Hehas all the provision he needs to regulate the water supply withoutconsulting the overflow and he needs only to distinguish between theclosed position and a fixed open position of the valve M (which may bemade visible by a suitable mark or index on the handle).

I am aware that it is not broadly new to form an injector with twooverflow chambers, which are controlled by automatic valves.

What I claim as my invention is- 1. In an injector, the combination withthe casing provided with separate chambers for the initial and secondaryoverflows, of separate valves controlling the discharge of the overflowfrom said chambers and operating automatically and in their turn oneupon the other to unseat by the force of the initial overflow and toseat by the force of the secondary overflow, substantially as described.

2. In an injector, the combination with the casing provided withseparate chambers for the initial and secondary overflows, of separatevalves controlling separate discharge openings from said chambers andoperating automatically and in their turn one upon the other to unseatby the pressure of the initial overflow against the valve controllingsaid overflow and to seat independently of each other by the pressure ofthe secondary overflow against each valve, substantially as described.

3. In an injector, the combination with the casing provided withseparate chambers for the initial and secondary overflows of separatevalves controlling separate discharge openings from said chambers andoperating automatically and in their turn one upon the other to unseatby the force of the initial over flow and to be seated by the force ofthe secondary overflow, the valve controllingZthe initial overflow beingprovided with a shoulder, substantially as described.

4. In an injector, the combination with the casing provided withseparate chambers for the initial and secondary overflow, of twoseparate floating valves controlling the discharge of the overflow fromsaid chambers and operating automatically by the force of said overflowacting reciprocally upon said valves to unseat and seat the same at theproper time said valves being adapted to unseat and seat one another,substantially as described.

5. In an injector, the combination with the casing provided withseparate chambers for the initial and secondary overflow, of twofloating valves controlling the overflow from said chambers andoperating automatically one upon the other and in their turn to unseatby the pressure of the initial overflow against the valve controllingsaid overflow and to be seated by the secondary overflow upon one orboth of said valves, the valve controlling the initial overflow being oflarger size and having a shoulder, substantially as described.

6. In an injector, the combination with. the casing, provided withseparate overflow chambers for the initial and secondary overflow, of

an overflow arm provided with lateral overflow openings on oppositesides through which said chambers communicate into said overflow arm,horizontally sliding wing valves of different area controlling saidoverflow openings, tubular guide bearings formed around said overflowopenings in which the wings of said valves are slidingly supported, andvalve chambers intermediate between the overflow openings and theoverflow chambers in the casing, substantially as described.

7. In an injector, the combination with. the casing provided withsepatate chambers for the initial and secondary overflow, of an overflowarm having lateral openings on opposite sides through which saidchambers communicate into the overflow arm, floating valvesautomatically controlling the discharge of the overflow from saidopenings into the overflow arm and valve casings intermediate betweenthe discharge openings and the overflow chambers, said valve casings,overflow openings and overflow arm being located below the overflowchambers in the casings and adapted to carry oi the leakage into theinjector, substantially as described.

8. In an injector, the combination with the casing provided withseparate chambers for the initial and secondary overflow, of thehorizontallysliding valves P and Q controlling separate overflowopenings from said chambers and adapted to operate automatically oneupon the other to unseat and seat by the pressure of the initial andsecondary overflow and the tubular guide bearingf around the stem of thevalve Qextendingin proximity to the valve P, substantially as described.

9. In an injector, the combination with the casing provided with theoverflow chamber G and delivery chamber II, of the overflow arm A thelateral openings N, 0, through which said chambers discharge into theoverflow, the horizontal sliding wing valvesP Q of unequal areacontrolling the said openings and oper ating automatically one upon theother to un seat and seat by the pressure of the initial andsecondaryoverflow respectively,the valve a water inlet branchcommunicating with the 10 chamber through a fixed port and a valveinterposed between the inlet branch and chamber for increasing the flowfrom the branch into the chamber, substantially as described.

In testimony whereof I affix my signature in presence of two witnesses.

JOHN DESMOND.

Witnesses:

M. B. ODOGHERTY, N. L. LINDOP.

